18.
Five soldiers on extended patrol need to drink water but it is muddy. How many
iodine purification tablets should be used per canteen?
a. None.
b. Boiling.
c.
One calcium hypochlorite tablet per canteen.
d. One iodine tablet per canteen.
e. Two iodine tablets per canteen.
19.
Orthotolidine, when added to water containing chlorine, produces a
_________________ color.
20.
What color is produced if orthotolidine is added to water containing chlorine that
has already reacted with sodium arsenite? ________________.
21.
The modified OTA method has been replaced by the ________ method.
22.
In the DPD method, a _________________ is used in place of a free available
chlorine tablet.
23.
In determining the pH with the color comparator, for what does the blank tube
compensate? ______________________________________.
24.
What is the required total disinfection time in checking for chlorine residual in a
canteen or a Lyster bag? _________________________.
25.
How many tincture of iodine drops should be used to disinfect a one-quart
canteen? _________________________________________________________
Check Your Answers on Next Page
MD0160
2-27